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The Numerical Simulation and Analsys of Couple External Flow Field

Author: ZhangDuQue
Tutor: SuChuQi
School: Wuhan University of Technology
Course: Vehicle Engineering
Keywords: Computational Fluid Dynamics Numerical Simulation Aerodynamic drag Aerodynamic lift Optimization
CLC: U461.1
Type: Master's thesis
Year: 2010
Downloads: 242
Quote: 4
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Abstract


With the development of automotive technology and the perfection of the road traffic, the car practical speed greatly improve car aerodynamics become one of the key research direction of the automotive industry. The traditional methods of car aerodynamics wind tunnel tests, this test facility requirements and a longer study period. With the development of computer technology, computational fluid dynamics (CFD) applications in automotive aerodynamics research also increasingly important CFD method has a short cycle, low-cost, no real vehicle model characteristics, using this method of analysis guidance design, improve product quality, enhance the role of the self-development capacity, have played in terms of vehicle development or improvement. The coupe features in sedan-based sports car elements added, both with cars manned, useful features, and sporty styling. Here CFD method for numerical modeling of three-dimensional flow field around a coupe, combined with the aerodynamic theory to analyze and optimize its aerodynamic styling and performance. This project comes from the the reverse design project of a coupe. The project is using CATIA draw 1:1 three-dimensional model of a real car. In the process of the establishment of the simulation model, taking into account the simulation time and computer hardware problems, make simplified some details of the real car. Then using ICEM software to create a finite element model. In this paper, a tetrahedron triangular prism grid mesh hybrid scheme, and the density of the body surrounds the entire coupe grid encryption processing to calculate the area of ??its surrounding, and do locally refined coupe surface surface mesh. Selection Realizableκ-ε turbulence model and standard wall function and its near the wall in order to improve the the Body surface flow simulation accuracy. Combined with a first-order upwind and second-order upwind two discrete format characteristics in the calculation process, the first order upwind, second order upwind iteration after a certain number of times, in order to improve the calculation accuracy and convergence, reduce the computing time . Finally, FLUENT model analysis and come to the body surface pressure distribution and velocity vector by analyzing the the vehicle surface speed and pressure characteristics, to understand the law and the case of air movement. The coupe's aerodynamic drag coefficient and lift coefficient is calculated and simulation results. Locally optimize the coupe styling combined automotive aerodynamic theory analysis, comparison and analysis of the before and after optimization results, to reduce aerodynamic drag and aerodynamic lift to improve the car economy and handling stability purposes, this sedan sports car styling improvements to provide a reference. According to the simulation results of this article and the combination of coupe styling can be seen for the coupe, due to the characteristics of the streamlined shape, the aerodynamic drag coefficient is relatively small, but the unstable aerodynamic lift coefficient. As for the coupe, this high-speed car, for security and stability considerations, to reduce the aerodynamic lift than to reduce the aerodynamic drag has more practical significance. Studies have shown that, with good regulation the coupe additional aerodynamic devices such as the tail of the aerodynamic lift. The car chassis structure is the simpler the better the aerodynamic performance of the vehicle. For the the coupe can even take advantage of such a high-speed car, the underbody surface to generate negative lift.

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CLC: > Transportation > Road transport > Automotive Engineering > Car theory > Vehicle dynamics and automotive mechanics
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